Recorder for rapid automatic telegraphy.



No. 650,096. Pa cented May 22, I900.

- c. r. RODDE.

RECORDER FOR RAPID AUTOMATIC TELEGRAPHY.

(Application filed Feb. 8, 1900.)

(No lddel.)

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UNITED STATES PATENT OFFICE.

CARL FRIEDRICH RODDE, OF BERLIN, GERMANY, ASSIGNOR TO SIEMENS &

IIALSKE AKTIEN-GESELLSGHAFT, OF SAME PLACE.

RECORDER FOR RAPID AUTOMATIC TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 650,096, dated May 22,1900.

Application filed-February 3, 1900. Serial No. 3,776. (No model.)

To all whom it may concern/.-

Beitknown that LOARL FRIEDRICH Ronnn, engineer, a subject of the GermanEmperor, residing at Markgrafenstrasse 94, Berlin,

Germany, have invented a certain new and useful Improvement in Recordersfor Rapid Automatic Electric Telegraphy, (Case No. 1,) of which thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of thisspecification.

The present invention relates to improvements in recorders for rapidautomatic electric telegraphy.

As is known to those conversant with the art, the general system ofrapid automatic telegraphy hitherto in use consists of a transmittinginstrument in which a record-strip previously provided with a row orrows of perforations indicating the different letters,

Words, or signs that are to be transmitted is fed, thus making andbreaking electric contacts or generally effecting electric connectionsadapted to transmit the signs indicated to the receiving-station, and ofa recording instrument adapted to receive and retain the signs thustransmitted. It is also known that a receiving instrument or recorderfor impulses of electric current thus transmitted 0 can be obtained byallowing such currents to flow through an electromagnet and by thevariations of attraction or repulsion thus obtained to vary the positionof a mirror, by which a ray of light is deflected, such deflec- 3 5tions being registered and retained by a strip of photographic papersensitive to light, which by suitable means is drawn past an openingtraversed by said ray of light. M y invention relates to recorders ofthis kind, and more especially to a novel system of deflecting the rayby which the signs are to be imprinted on the recording-strip ofsensitive paper.

The invention consists in employing cathode-rays in the place ofordinary light-rays, 5 andI propose to take advantage of the propertypossessed by cathode-rays to vary their direction when the direction orintensity of magnetic field is varied through which they pass. I thusobtain the advantage over the above-cited older systems of recordersthat with my system it becomes superfluous to move any mechanical parts,such as a mirror and its fastenings.

The accompanying drawing is a diagrammatical representation of therecorder accord- 5 5 ing to this invention, showing only those partswhich strictly pertain to the present invention, since all other parts,though necessary for the practical performance of actual telegraphy, arewell known to those conversant with the present state of the art.

In the drawings, B represents a local battery or other suitable sourceof electricity. The battery B is connected in the usual way by suitableconductors c to the primary windings of an induction-coil I, furnishedwith a suitable interrupter. The secondary windings of saidinduction-coil are in their turn connected in the usual Way by suitableconductors c to the electrodes of glass bulb O, arranged in the usualway for the production of cathode-rays.

W is a wire coming from the transmittingstation and conveying theimpulses of current representing the signs that are to be recorded.

In the actual use of the instrument arelay might be employed to call upthe operator and to perform other functions necessary or useful inelectric telegraphy; but as these functions do not directly appertain tothe purpose and use of the herein-described recording instrument theyare not shown.

In the conductor W, conveying the currentimpulses, an electromagnet E isinserted, which is placed in the vicinity of the cathoderay bulb, so asto deflect the cathode-rays produced therein. At the end of the bulb afluorescent screen is provided, on which a luminous spot is producedwhere the screen is struck by the rays. In a suitable distance from thesaid screen a system of lenses L is provided, by which the light emittedby the luminous spot is. projected and concentrated onto a strip ofsensitive paper P, suitable 5 means being provided for feeding the paperpast the place where it is struck by the pen oil of light. As soon as acurrent passes through the electromagnet E the cathoderays are deflectedby the magnetic fleld thus 10o created, and the luminous spot on thefluorescent screen S is therefore shifted, corresponcb ingly shiftingthe image projected on the sensitive paper. It is evident that bysuitably varying the intensity of interrupting or reversing theexciting-current a curved line or a series of differently-located linesor dots will be registered on the paper, and by employing any one systemof known telegraphic alphabets messages can be recorded by this meansand can be obtained by developing the image produced on the paper in theordinary way.

Having now particularly described and ascertained the nature of my saidinvention and in What manner the same is to be performed, I declare thatWhat I claim is- 1. A recording instrument for rapid automatictelegraphy consisting of means for producing cathode-rays in combinationwith an electromagnet adapted to deflect same and of means forregistering such deflections.

2. A recording instrument for automatic rapid-transmission telegraphyconsisting of the combination with a glass bulb adapted for theproduct-ion of cathode-rays, means for producing the same, anelectromagnet excited by the transmitting-current and placed in theproximity of said bulb and a fluorescent screen contained in said bulbof a suitable photographic camera for registering the deflections ofsaid cathode-rays caused by said exciting-current.

3. A recording instrument for rapid automatic telegraphy consisting ofthe combination of a glass bulb adapted for the production of cathoderays an electromagnet inserted in the conductor conveying the currentimpulses coming from the transmittingstation said magnet being placed inthe proximity of said bulb a fluorescent screen placed in said bulb Withsuitable means for recording the movements of the luminous spot causedby said cathode-rays on said fluorescent screen.

4. A recorder for rapid automatic telegraphy consisting of thecombination of a glass bulb adapted for the production of cathoderaysand containing a fluorescent screen upon which said cathode-rays areprojected and cause a luminous spot to appear and of means for producingsuch rays with an electromagnet excited by the transmitted currentimpulses and placed in the proximity of said bulb so as to deflect saidcathode-rays and to cause movements of said luminous spot When variouslyexcited, a photographic camera adapted to retain an image of saidluminous spot and with means for continuously moving the sensitivematerial in said camera.

In Witness whereof I have hereunto subscribed myname this 2d day ofJanuary, A. D. 1900.

CARL FRIEDRICH RODDE,

Witnesses:

ERNST DILLAN, RICHARD LEFFSON.

